Automatically change ticket comments from public into a private one

Hello,

I am trying to automatically change public comments to private when tickets are submitted from a particular group of end users or any end users, (tickets submitted via webform , email etc)? The ticket comment ID is different for each individual comment. So, I'm not sure how to add capture that in the ticket and have the webhook trigger.

Is there a method, or system for automatically obtaining the comment ID when a ticket is created (by endusers), utilise them on a webhook to automatically switch the first comments from public to private?

Thanks